/*
             * stickyfloat - jQuery plugin for verticaly floating anything in a constrained area
             *
             * Example: jQuery('#menu').stickyfloat({duration: 400});
             * parameters:
             *      duration    - the duration of the animation
             *      startOffset - the amount of scroll offset after it the animations kicks in
             *      offsetY     - the offset from the top when the object is animated
             *      lockBottom  - 'true' by default, set to false if you don't want your floating box to stop at parent's bottom
             * $Version: 05.16.2009 r1
             * Copyright (c) 2009 Yair Even-Or
             * vsync.design@gmail.com
             */

            $.fn.stickyfloat = function(options, lockBottom) {
                var $obj                = this;
                var parentPaddingTop    = parseInt($obj.parent().css('padding-top'));
                var startOffset         = $obj.parent().offset().top;
                var opts                = $.extend({ startOffset: startOffset, offsetY: parentPaddingTop, duration: 200, lockBottom:true }, options);

                $obj.css({ position: 'absolute' });

                if(opts.lockBottom){
                    var bottomPos = $obj.parent().height() - $obj.height() + parentPaddingTop; //get the maximum scrollTop value
                    if( bottomPos < 0 )
                        bottomPos = 0;
                }

                $(window).scroll(function () {
                    $obj.stop(); // stop all calculations on scroll event

                    var pastStartOffset         = $(document).scrollTop() > opts.startOffset;   // check if the window was scrolled down more than the start offset declared.
                    var objFartherThanTopPos    = $obj.offset().top > startOffset;  // check if the object is at it's top position (starting point)
                    var objBiggerThanWindow     = $obj.outerHeight() < $(window).height();  // if the window size is smaller than the Obj size, then do not animate.

                    // if window scrolled down more than startOffset OR obj position is greater than
                    // the top position possible (+ offsetY) AND window size must be bigger than Obj size
                    if( (pastStartOffset || objFartherThanTopPos) && objBiggerThanWindow ){
                        var newpos = ($(document).scrollTop() -startOffset + opts.offsetY );
                        if ( newpos > bottomPos )
                            newpos = bottomPos;
                        if ( $(document).scrollTop() < opts.startOffset ) // if window scrolled < starting offset, then reset Obj position (opts.offsetY);
                            newpos = parentPaddingTop;

                        $obj.animate({ top: newpos }, opts.duration );
                    }
                });
            };

